Install SE Linux python bindings

Install SE Linux python bindings in the common role, before copying any files into place. Fixes an issue deploying against CentOS in AWS.

lamp_haproxy/roles/common/tasks/main.yml

@@ -1,6 +1,12 @@
 ---
 # This role contains common plays that will run on all nodes.
 
+- name: Install python bindings for SE Linux
+  yum: name={{ item }} state=present
+  with_items:
+   - libselinux-python
+   - libsemanage-python
+
 - name: Create the repository for EPEL
   copy: src=epel.repo dest=/etc/yum.repos.d/epel.repo